PSTN Usages

The PSTN usage object in Lync Server often seems confusing because it has no settings or configuration options other than a name. There are no user options or policies configured on a usage and it cannot even be created by itself. PSTN usages can be considered the glue between a voice policy and a route in Lync.

PSTN usages are usually named based on a particular type of call and a destination, or an egress point. For example, a usage called US-CA-SFO-National might be used to identify national calls leaving through a gateway in the San Francisco, California, office. Another example could be a usage called US-IL-CHI-Local, which identifies calls considered local to a gateway in the Chicago, Illinois, office.

Remember, though, a PSTN usage is simply a name. Nothing more, nothing less. It is, however, associated with both a voice policy and a route, which is why it is considered the glue between the two.

Note

The obvious question here is why bother with PSTN usages if all they do is tie two other objects together? Wouldn’t it make more sense to just put routes inside a voice policy? The answer is because a single usage can be associated with multiple routes.

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